Are you sure about your labeling?
I think the one in the middle on the bottom is a Whitetip Reef Shark (Triaenodon obesus), the one right in the background has the shape of a Zebra Shark (Stegostoma fasciatum). The one in front left could be a Blacktip Reef Shark, but what irritates me is the missing of the black color on the top of its pectoral fins. Maybe another species of the Carcharhinus family?
Are you sure about your labeling?
I think the one in the middle on the bottom is a Whitetip Reef Shark (Triaenodon obesus), the one right in the background has the shape of a Zebra Shark (Stegostoma fasciatum). The one in front left could be a Blacktip Reef Shark, but what irritates me is the missing of the black color on the top of its pectoral fins.
I agree with you fully - the middle is definatly Whitetip RS, the background one is most likely a zebra shark (don't have enough detail, but 90% sure) and the front one if I'm not mistaken there is a sliver of back on the top fin - so that would suggest a Blacktip RS - but however as you said we cannot see the pectoral fins :/
The entire list of species found in Shark Lagoon shown in the supplied guidebook include: Blacktip Reef Shark, San Tiger Shark, Zebra Shark(which I did not label in this photo seen in the background), Freshwater Sawfish, Reticulate Whiptail Ray, White-spotted Bamboo Shark, Brown-banded bamboo Shark, Epaulette Shark. That's what I was going by in my closest estimate. Maybe the Whitetip is a more recent addition to the collection, but the one to the left is definitely a Blacktip Reef Shark; see some of the other photos.